一、引言目前,测量材料条件屈服应力σ_(0.2)的方法均按GB228—76中规定的引伸仪法进行,而对于标距较小的试件,由于一般单位引伸仪的规格不齐全,所以变得困难。我们在测量小标距试件的σ_(0.2)时采用了电阻应变片的方法。下面就介绍这种测量方法。二、测量方法因为条件屈服应力σ_(0.2)的定义是:材料产生的残余变形量达到标距的0.2％时所对应的应力,所以采用电阻应变仪读数时,也 I. INTRODUCTION At present, the methods for measuring the yield stress σ_ (0.2) under the material conditions are all carried out according to the extensometer method specified in GB228-76. For the specimens with smaller gauge distances, the specifications of the general unit extensometers are not complete, It becomes difficult. We used the method of resistance strain gauges when measuring the σ_ (0.2) of a small gauge specimen. The following describes this measurement method. Second, the measurement method Because the conditional yield stress σ_ (0.2) is defined as: the residual deformation of the material reaches 0.2% of the gauge when the corresponding stress, so the use of resistance strain gauge reading